/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.plugin.task.mr;

import org.apache.dolphinscheduler.common.utils.JSONUtils;
import org.apache.dolphinscheduler.plugin.task.api.AbstractYarnTask;
import org.apache.dolphinscheduler.plugin.task.api.TaskConstants;
import org.apache.dolphinscheduler.plugin.task.api.TaskExecutionContext;
import org.apache.dolphinscheduler.plugin.task.api.model.Property;
import org.apache.dolphinscheduler.plugin.task.api.model.ResourceInfo;
import org.apache.dolphinscheduler.plugin.task.api.parameters.AbstractParameters;
import org.apache.dolphinscheduler.plugin.task.api.parser.ParamUtils;
import org.apache.dolphinscheduler.plugin.task.api.parser.ParameterUtils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * mapreduce task
 */
public class MapReduceTask extends AbstractYarnTask {

  /**
   * mapreduce command
   * usage: hadoop jar <jar> [mainClass] [GENERIC_OPTIONS] args...
   */
  private static final String MAPREDUCE_COMMAND = TaskConstants.HADOOP;

  /**
   * mapreduce parameters
   */
  private MapReduceParameters mapreduceParameters;

  /**
   * taskExecutionContext
   */
  private TaskExecutionContext taskExecutionContext;

  /**
   * constructor
   *
   * @param taskExecutionContext taskExecutionContext
   */
  public MapReduceTask(TaskExecutionContext taskExecutionContext) {
    super(taskExecutionContext);
    this.taskExecutionContext = taskExecutionContext;
  }

  @Override
  public void init() {

    logger.info("mapreduce task params {}", taskExecutionContext.getTaskParams());

    this.mapreduceParameters = JSONUtils.parseObject(taskExecutionContext.getTaskParams(), MapReduceParameters.class);

    // check parameters
    if (mapreduceParameters == null || !mapreduceParameters.checkParameters()) {
      throw new RuntimeException("mapreduce task params is not valid");
    }

    mapreduceParameters.setQueue(taskExecutionContext.getQueue());
    setMainJarName();

    // replace placeholder,and combine local and global parameters
    Map<String, Property> paramsMap = taskExecutionContext.getPrepareParamsMap();

    String args = ParameterUtils.convertParameterPlaceholders(mapreduceParameters.getMainArgs(), ParamUtils.convert(paramsMap));
    mapreduceParameters.setMainArgs(args);
    if (mapreduceParameters.getProgramType() != null && mapreduceParameters.getProgramType() == ProgramType.PYTHON) {
      String others = ParameterUtils.convertParameterPlaceholders(mapreduceParameters.getOthers(), ParamUtils.convert(paramsMap));
      mapreduceParameters.setOthers(others);
    }
  }

  /**
   * build command
   *
   * @return command
   */
  @Override
  protected String buildCommand() {
    // hadoop jar <jar> [mainClass] [GENERIC_OPTIONS] args...
    List<String> args = new ArrayList<>();
    args.add(MAPREDUCE_COMMAND);

    // other parameters
    args.addAll(MapReduceArgsUtils.buildArgs(mapreduceParameters));

    String command = ParameterUtils.convertParameterPlaceholders(String.join(" ", args),
        taskExecutionContext.getDefinedParams());
    logger.info("mapreduce task command: {}", command);

    return command;
  }

  @Override
  protected void setMainJarName() {
    // main jar
    ResourceInfo mainJar = mapreduceParameters.getMainJar();
    String resourceName = getResourceNameOfMainJar(mainJar);
    mainJar.setRes(resourceName);
    mapreduceParameters.setMainJar(mainJar);
  }

  @Override
  public AbstractParameters getParameters() {
    return mapreduceParameters;
  }
}
